Medicinal Chemistry - Fusion of Traditional and Western Medicine, First Edition


Robert E. Smith

DOI: 10.2174/97816080514961130101
eISBN: 978-1-60805-149-6, 2013
ISBN: 978-1-60805-154-0

Indexed in: Scopus, EBSCO.

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How New Drugs are Developed: Toxicology

- Pp. 132-162 (31)

Robert E. Smith


The first rule of toxicology is that the dose itself is the poison. That is, every substance is toxic if given at a high enough dose. Toxicity testing in animals (preferably rodents) is required for investigational new drugs. The EPA conducts toxicity tests on environmental chemicals through the National Institute of Environmental Health (NIEHS) and the Environmental Toxicology Program (ETP). They give very large doses of test chemicals to rodents to see if they might be harmful to the small portion of humans who are highly susceptible to the test chemical. GLP was formulated by the US Food and Drug Administration (FDA) to regulate non-clinical studies on the safety and possible toxicity of a new compound. The European Organization for Cooperation and Development (OECD) has its own GLP regulations that overlap with the FDA GLP. Every GLP study must have a study director, who writes a study protocol and is responsible for the design, conduct and reporting of the study. Many GLP studies also have principal investigators (PIs). In contract labs that work for the NIEHS, there is a single PI who has overall responsibility for the GLP studies. The PI has the authority to approve all study protocols or any amendments.

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